Grigory Begelman, Philipp Keller, Frank Smadja; Technion Israel Institute of Technology, Citrin Informatik GmbH and RawSugar at Collaborative Tagging Workshop WWW 2006
Jenneke Fokker, Johan Pouwelse and Wray Buntine; Departments of Industrial Design and Computer Sciences Delft University of Technology The Netherlands and Department of Computer Science, Helsinki Institute of Information Technology at Collaborative Taggi
M. Nentwich. ita-Manuskript, ita-09-02. Institut für Technikfolgen-Abschätzung an der Österreichischen Akademie der Wissenschaften, Wien, (November 2009)